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<head>
  <meta charset="UTF-8">
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  <title>Document</title>
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  <script>
    const makeMultiplier=(a)=>{
      const fn=(b)=>a*b
      return fn
    }

    const multiplyByThree = makeMultiplier(3)
    console.log(multiplyByThree(5));
    console.log(multiplyByThree(10));
  </script>
</body>
</html>